[Batch/Bash] Minecraft StartScript [start|stop|restart|attach|status]

#!/bin/bash

### BEGIN INIT INFO
# Provides: Minecraft StartScript v1.0
# Required-Start: $remote_fs $syslog
# Required-Stop: $remote_fs $syslog
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Starts the minecraft server
# Description: Starts the minecraft server specified below. You can also create a cron job to sceduele restarts of your minecraft server (recommended).
### END INIT INFO

########################
#
# Minecraft StartScript v1.0
# Copyright (C) 2011 by Silthus
#
#########################################


###################
# CONFIGURATION #
#########################################
# NAME: user to start Minecraft from (dont run as root (u wont be able to anyways!))
# PATH: directory containing the Minecraft Server File (= working directory) (needs / at the end)
# BIN: your server executable, e.g.: minecraft_server.jar
# ID: a unique identifier for this screen session (like servers name)
# must be different for every server
#
# To restart your server every 6 hours at midnight, 6, 12 and 6 o clock put this line in your crontab:
# # Minute Hour Day of Month Month Day of Week Command
# (0-59) (0-23) (1-31) (1-12 or Jan-Dec) (0-6 or Sun-Sat)
# 0 0,6,12,18 * * * /etc/init.d/minecraft restart
#

NAME='minecraft'
PATH='/home/minecraft/bin/'
BIN='craftbukkit.jar'
ID='RaidCraft'
PARAMS='-Xms512M -Xmx2048M'


############################
# ADVANCED CONFIGURATION #
#########################################

# in case you have custom application paths, edit here
GREP='/bin/grep'
SCREEN='/usr/bin/screen'
JAVA='/usr/bin/java'
SLEEP='/bin/sleep'

# colors: default, red, green, yellow, blue
D='\E[0m'
R='\E[1;31m'
G='\E[1;32m'
Y='\E[1;33m'
B='\E[1;34m'


################################################
# do not edit below here #
# unless you REALLY know what you are doing !! #
################################################


echo -e "\E[1;34;40m Minecraft StartScript ${Y}v1.0 ${B}by ${G}Silthus${D}"

# check dependencies
if [ ! -x "$GREP" ]; then
 echo -e "${R}Error: grep not found in ${B}'$GREP$'${D}"
 echo -e "${Y}Install with your packet manager or edit advanced config!${D}"
 exit 1
fi
if [ ! -x "$SCREEN" ]; then
 echo -e "${R}Error: screen not found in ${B}'$SCREEN'${D}"
 echo -e "${Y}Install with your packet manager or edit advanced config!${D}"
 exit 1
fi
if [ ! -x "$JAVA" ]; then
 echo -e "${R}Error: java not found in ${B}'$JAVA$'${D}"
 echo -e "${Y}Install with your packet manager or edit advanced config!${D}"
 exit 1
fi
if [ ! -x "$SLEEP" ]; then
 echo -e "${R}Error: sleep not found in ${B}'$SLEEP$'${D}"
 echo -e "${Y}Install with your packet manager or edit advanced config!${D}"
 exit 1
fi

# check for root permission
if [ $UID = 0 ]; then
 ROOT=true
 echo -e "${R}Do not run as ROOT!${D}"
 exit 1
else
 ROOT=false
fi

cd $PATH


###############
# functions #
#########################################

start() {
echo -e "${Y}Starting ${B}$ID ${Y}...${D}"

if status; then
 echo -e "${R}Error: ${B}$ID ${R}is already running!${D}"
 exit 1
fi
 $SCREEN -AmdS $ID $JAVA $PARAMS -jar $BIN nogui
}

stop() {
echo -e "${Y}Stopping ${B}$ID ${Y}...${D}"

if ! status; then
 echo -e "${R}Error: ${B}$ID ${R}is not running!${D}"
 exit 1
fi
 $SCREEN -S $ID -p 0 -X stuff "`printf "say Going down in 10 seconds! Saving world...\r"`"
 echo -e "${B}Waiting 10 seconds for the World to save ...${D}"
 $SLEEP 5
 $SCREEN -S $ID -p 0 -X stuff "`printf "save-all\r"`"
 $SLEEP 5
 $SCREEN -S $ID -p 0 -X stuff "`printf "stop\r"`"
 echo -e "${G}Shutting down ...${D}"
 $SLEEP 2
}

status() {
 $SCREEN -ls | $GREP [.]$ID[[:space:]] > /dev/null
}

attach() {
if ! status; then
 echo -e "${R}Error: ${B}$ID ${R}is not running!${D}"
 exit 1
fi
 $SCREEN -S $ID -r
}


# parameter parsing
case "$1" in
start)
 start
 echo -e "${G} ... done.${D}"
;;

stop)
 stop
 echo -e "${G} ... done.${D}"
;;

restart)
 status
 $SCREEN -S $ID -p 0 -X stuff "`printf "say Restarting in 10 seconds! Saving world...\r"`"
 echo -e "${B}Waiting 10 seconds for the World to save ...${D}"
 $SLEEP 5
 $SCREEN -S $ID -p 0 -X stuff "`printf "save-all\r"`"
 $SLEEP 5
 $SCREEN -S $ID -p 0 -X stuff "`printf "stop\r"`"
 echo -e "${B}Waiting 10 seconds for the RAM to clear ...${D}"
 $SLEEP 10
 start
;;

status)
 if status; then
 echo -e "${B}$ID ${G}is running ${B}${D}"
 else
 echo -e "${B}$ID ${R}is not running!${D}"
 fi
;;

attach)
 attach
;;

*)
 echo -e "${Y}Usage: $0 {${G}start${Y}|${R}stop${Y}|${B}restart${Y}|${B}status${Y}|${B}attach${Y}} ${Y}[ID]${D}"
 echo -e "${Y}While attached press ${B}ctrl-a crlt-d ${Y}to stop watching without stopping the server!"
 exit 1
;;
esac